Keck Next Generation Adaptive Optics
NGAO System Design Phase: Work Scope Planning Sheet
WBS Element Title:
WBS Element Number:
Work Package Lead:
Work Package Participants:
PSF camera
3.2.3.12
Matthew Britton, (Chris Neyman diagnostic tasks lead)
Matthew Britton, Chris Neyman
1. Work Scope
WBS Dictionary Entry:
Develop a concept for a PSF camera that can be used for PSF calibration of science
data as post observing data reduction task.
Requirements:
Could not find original WBS in NGAO April 2007 planning documentation so I
drafted the one above.
2. Inputs:
A key assumption is the WBS above. In addition the photometric and astrometric
performance budgets previously developed for NGAO will be used to define the
requirements on the PSF camera.
3. Products:
This WBS will produce a report covering the design of the PSF camera at a conceptual
level, it will list a set of requirements, describe the system including interfaces to other
parts of the NGAO system, list high cost/risk items, highlight areas for further study
during the preliminary design phase. See draft table of contents for the report at the
bottom of this documented. (See attached email with working revisions)
4. Methodology:
Review requirements from PSF estimation placed on PSF camera. Review available
techniques. Develop concept for PSF camera. Evaluate concept against requirements.
Determine interfaces to the rest of NGAO system. Identify risk and high cost items.
Write report. The emphasis of this task will be on determining a measurement and
post processing strategy for the PSF measurement. Less emphasis will be placed on
integration into the NGAO system optical/mechanical design.
5. Estimate of effort:
Current estimate for the task is 20 hours for Britton ((See attached email with
working revisions)
6. Approvals:
Control
Name
Authored by:
Chris Neyman
Approved by:
WBS X.X Lead
NGAO EC Chair
Updated 7/13/2016 at 6:47 AM by Author
-1-
Date
9/11/07 revised 9/28/07
Revised 11/30/07
Title
Date
Outline of final report
Although the final and definitive repository for requirements is the functional requirements document
(FRD) and for risk items it will be the system engineering management plan (SEMP). These items are
listed below as a more complete and thorough discussion of the requirements rational and risk mitigation
is usually provided in technical notes for individual subsystems. These notes or reports are then
referenced in the FRD and SEMP.
1. Overview of PSF camera requirements
2. Table of requirements
3. Concepts for profiler
4. Evaluation of concepts against requirements, with special emphasis on measurement and data
post processing feasibility.
5. Recommendation for preliminary design work.
6. List of high cost and long lead item
7. List of high risk items and mitigation strategies
_____________________________________________
From: Chris Neyman
Sent: Thursday, November 29, 2007 3:35 PM
To: Matthew Britton
Cc: 'Richard Dekany'; Peter Wizinowich
Subject: NGAO: new plan for Cn2 profiler and PSF camera
Hi Matthew,
I talked to Peter this afternoon about how we might revise your work on NGAO. Peter was O.K. with
what we discussed on the phone earlier today (11/29/2007). Just so everybody on the same page, the
new plan is:
PSF Camera:
You’ll take a limited number of hours (20 or less) to write up your thoughts on the feasibility
of using a separate PSF camera.
These included the following issues we disused today:
1) Accounting for PSF camera not being at the final science focal plan
2) Capturing atmospheric and AO variability during the science exposure
3) Non common path error
4) Calibration
5) Overall accuracy of the method
6) Etc.
The EC will review and comment. It would be good to get Ralf’s comments as well.
Your notes and any comments will be collated as the final report.
Let me know if this is O.K.
--Chris
Updated 7/13/2016 at 6:47 AM by Author
2